In reply to:
"So you spend a lot of time on making the perfect burger for your restaurant. You patent it. I live on the other side of the planet and have never heard of your recipe or restaurant. I make a burger that I like for my restaurant and it is very similar to yours. Now I have to pay you 50 cent per burger I sell.
"

Do you think that would be a valid patent?
For me it seems an obvious invention.